The "scientist" presents a lot of gear, including complicate spinning devices and measuring instruments and perferably, some kind of capacitors.

Then he's contacted by someone who has funds, and hopes to make more money.

He will claim he's very close to a breakthrough, the device actually works just cant be mass fabricated now. Some kind of investment is needed. The complicated machines are mainly presented in order to confuse, it may work well on someone who doesnt understand technology.

At a later stage, eventually some batches of fake devices are actually produced (such as clamp on magnets for fuel pipes).

there might be large magnets and hidden induction coils under the table (thats how these motors spin for hours from a tiny capacitor).

Hey all, i have a question that can WiFi signals be converted to energy (DC power)? If yes then how?

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Absolutely! WiFi signals are energy are they not? All transmitted signals are energy so all we need to do is receive them and convert them back to energy. When I was a kid during the late 50s I strung a 40 meter dipole antenna from a maple tree in front of the house to a cherry tree in the backyard for my first ever short wave receiver. I noticed that if I bumped the antenna wire against ground (copper water pipe) I saw a small spark. Imagine that, at 9 years old I discovered free energy. I pointed my new discovery out to my dad who actually was an EE. He wasn't as excited or amazed as I was but did encourage me to have at my new discovery. His words do still on occasion echo in my head, "Ronald, you can't get something for nothing". I discovered I could not even light a tiny flashlight lamp with my new found source of power. LEDs were not invented yet so I settled for flashlight lamps.